Android - 将字符串转换为byte[]

Question

我想将“icon”字符串转换为字节数组，再将其转换为位图。问题是模拟器中的图像没有显示出来。我猜我做错了什么，但我不知道为什么。非常感谢您的帮助。提前致谢。

这是我的JSON数据：

{
    "project": [
        {
            "abbreviation": "abd",
            "customer": "customer1",
            "description": "description1",
            "icon": "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",
            "name": "projectname1",
            "plannedEndDate": "2012-05-25T00:00:00+01:00",
            "plannedStartDate": "2012-05-23T00:00:00+01:00",
            "projectStatus": {
                "name": "Opened"
            },
            "realEndDate": "2012-05-25T00:00:00+01:00",
            "realStartDate": "2012-05-23T00:00:00+01:00"
        }
    ]
}

我按照那样做了，但它不起作用：

// convert String to byte[]
String stringToConvert = project.getIcon();
byte[] theByteArray = stringToConvert.getBytes();

// convert Byte[] to Bitmap
Bitmap bm = BitmapFactory.decodeByteArray(theByteArray,
        0, theByteArray.length);
DisplayMetrics dm = new DisplayMetrics();

holder.imageIcon.setMinimumHeight(dm.heightPixels);
holder.imageIcon.setMinimumWidth(dm.widthPixels);
holder.imageIcon.setImageBitmap(bm);

- Wijden

Answer 1

从字符串icon来看，似乎您已经使用Base64将图像转换为字符串。因此，您需要使用Base64本身将其转换回字节。

// Receiving side
byte[] data = Base64.decode(iconString, Base64.DEFAULT);

希望这能有所帮助...

- bakriOnFire

Answer 2

要将您的base64字符串解码为byte[]：

byte[] imgBytes = Base64.decode(strBase64.getBytes());

将您的byte[]转换为Bitmap：

Bitmap bitmap = BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length)

现在，使用bitmap和图片的setImageBitmap方法来显示输出。例如：

icon.setImageBitmap(bitmap);

- waqaslam

---

非常感谢，但我必须这样做。按照您所说的方式进行操作时会出现错误：byte[] imgBytes = Base64.decode(strBase64.getBytes(), Base64.DEFAULT); - Wijden

Answer 3

您的图标是Base64编码的，请使用Base64类解码。

- Grzegorz Żur